Make DocumentFragment implement Element.

client/html/src/DocumentFragmentWrappingImplementation.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+class FilteredElementList implements ElementList {
+  final Node _node;
+  final NodeList _childNodes;
+
+  FilteredElementList(Node node): _childNodes = node.nodes, _node = node;
+
+  // We can't memoize this, since it's possible that children will be messed
+  // with externally to this class.
+  //
+  // TODO(nweiz): Do we really need to copy the list to make the types work out?
+  List<Element> get _filtered() =>
+    new List.from(_childNodes.filter((n) => n is Element));
+
+  // Don't use _filtered.first so we can short-circuit once we find an element.
+  Element get first() {
+    for (var node in _childNodes) {
+      if (node is Element) {
+        return node;
+      }
+    }
+    return null;
+  }
+
+  void forEach(void f(Element element)) {
+    _filtered.forEach(f);
+  }
+
+  void operator []=(int index, Element value) {
+    this[index].replaceWith(value);
+  }
+
+  void set length(int newLength) {
+    var len = this.length;
+    if (newLength >= len) {
+      return;
+    } else if (newLength < 0) {
+      throw const IllegalArgumentException("Invalid list length");
+    }
+
+    removeRange(newLength - 1, len - newLength);
+  }
+
+  void add(Element value) {
+    _childNodes.add(value);
+  }
+
+  void addAll(Collection<Element> collection) {
+    collection.forEach(add);
+  }
+
+  void addLast(Element value) {
+    add(value);
+  }
+
+  void sort(int compare(Element a, Element b)) {
+    throw const UnsupportedOperationException('TODO(jacobr): should we impl?');
+  }
+
+  void copyFrom(List<Object> src, int srcStart, int dstStart, int count) {
+    throw const NotImplementedException();
+  }
+
+  void setRange(int start, int length, List from, [int startFrom = 0]) {
+    throw const NotImplementedException();
+  }
+
+  void removeRange(int start, int length) {
+    _filtered.getRange(start, length).forEach((el) => el.remove());
+  }
+
+  void insertRange(int start, int length, [initialValue = null]) {
+    throw const NotImplementedException();
+  }
+
+  void clear() {
+    // Currently, ElementList#clear clears even non-element nodes, so we follow
+    // that behavior.
+    _childNodes.clear();
+  }
+
+  Element removeLast() {
+    var last = this.last();
+    if (last != null) {
+      last.remove();
+    }
+    return last;
+  }
+
+  Collection<Element> filter(bool f(Element element)) => _filtered.filter(f);
+  bool every(bool f(Element element)) => _filtered.every(f);
+  bool some(bool f(Element element)) => _filtered.some(f);
+  bool isEmpty() => _filtered.isEmpty();
+  int get length() => _filtered.length;
+  Element operator [](int index) => _filtered[index];
+  Iterator<Element> iterator() => _filtered.iterator();
+  List<Element> getRange(int start, int length) =>
+    _filtered.getRange(start, length);
+  int indexOf(Element element, int startIndex) =>
+    _filtered.indexOf(element, startIndex);
+  int lastIndexOf(Element element, int startIndex) =>
+    _filtered.lastIndexOf(element, startIndex);
+  Element last() => _filtered.last();
+}
+
+class EmptyStyleDeclaration implements CSSStyleDeclaration {
+  String get cssText() => "";
+  int get length() => 0;
+  CSSRule get parentRule() => null;
+  CSSValue getPropertyCSSValue(String propertyName) => null;
+  String getPropertyPriority(String propertyName) => "";
+  String getPropertyShorthand(String propertyName) => null;
+  String getPropertyValue(String propertyName) => null;
+  bool isPropertyImplicit(String propertyName) => false;
+  String item(int index) => "";
+
+  void set cssText(String value) {
+    throw new UnsupportedOperationException(
+        "Can't modify a frozen style declaration.");
+  }
+
+  String removeProperty(String propertyName) {
+    throw new UnsupportedOperationException(
+        "Can't modify a frozen style declaration.");
+  }
+
+  void setProperty(String propertyName, String value, [String priority]) {
+    throw new UnsupportedOperationException(
+        "Can't modify a frozen style declaration.");
+  }
+}
+
+class EmptyClientRect implements ClientRect {
+  num get bottom() => 0;
+  num get top() => 0;
+  num get left() => 0;
+  num get right() => 0;
+  num get height() => 0;
+  num get width() => 0;
+}
+
 class DocumentFragmentWrappingImplementation extends NodeWrappingImplementation implements DocumentFragment {
+  ElementList _elements;
+
   DocumentFragmentWrappingImplementation._wrap(ptr) : super._wrap(ptr) {}
 
   factory DocumentFragmentWrappingImplementation() {
     return new DocumentFragmentWrappingImplementation._wrap(
             dom.document.createDocumentFragment());
   }
 
-  Element query(String selectors) {
-    return LevelDom.wrapElement(_ptr.querySelector(selectors));
-  }
-
-  ElementList queryAll(String selectors) {
-    return LevelDom.wrapElementList(_ptr.querySelectorAll(selectors));
-  }
-}
+  factory DocumentFragmentWrappingImplementation.html(String html) {
+    var fragment = new DocumentFragment();
+    fragment.innerHTML = html;
+    return fragment;
+  }
+
+  ElementList get elements() {
+    if (_elements == null) {
+      _elements = new FilteredElementList(this);
+    }
+    return _elements;
+  }
+
+  // TODO: The type of value should be Collection<Element>. See http://b/5392897
+  void set elements(value) {
+    // Copy list first since we don't want liveness during iteration.
+    List copy = new List.from(value);
+    final elements = this.elements;
+    elements.clear();
+    elements.addAll(copy);
+  }
+
+  String get innerHTML() {
+    var e = new Element.tag("div");
+    e.nodes.add(this.clone(true));
+    return e.innerHTML;
+  }
+
+  String get outerHTML() => innerHTML;
+
+  void set innerHTML(String value) {
+    this.nodes.clear();
+
+    var e = new Element.tag("div");
+    e.innerHTML = value;
+
+    // Copy list first since we don't want liveness during iteration.
+    List nodes = new List.from(e.nodes);
+    this.nodes.addAll(nodes);
+  }
+
+  Node _insertAdjacentNode(String where, Node node) {
+    switch (where.toLowerCase()) {
+      case "beforebegin": return null;
+      case "afterend": return null;
+      case "afterbegin":
+        this.insertBefore(node, nodes.first);
+        return node;
+      case "beforeend":
+        this.nodes.add(node);
+        return node;
+      default:
+        throw new IllegalArgumentException("Invalid position ${where}");
+    }
+  }
+
+  Element insertAdjacentElement([String where = null, Element element = null])
+    => this._insertAdjacentNode(where, element);
+
+  void insertAdjacentText([String where = null, String text = null]) {
+    this._insertAdjacentNode(where, new Text(text));
+  }
+
+  void insertAdjacentHTML(
+      [String position_OR_where = null, String text = null]) {
+    this._insertAdjacentNode(
+      position_OR_where, new DocumentFragment.html(text));
+  }
+
+  ElementEvents get on() {
+    if (_on === null) {
+      _on = new ElementEventsImplementation._wrap(_ptr);
+    }
+    return _on;
+  }
+
+  Element query(String selectors) =>
+    LevelDom.wrapElement(_ptr.querySelector(selectors));
+
+  ElementList queryAll(String selectors) =>
+    LevelDom.wrapElementList(_ptr.querySelectorAll(selectors));
+
+  // If we can come up with a semi-reasonable default value for an Element
+  // getter, we'll use it. In general, these return the same values as an
+  // element that has no parent.
+  int get clientHeight() => 0;
+  int get clientWidth() => 0;
+  int get offsetHeight() => 0;
+  int get offsetWidth() => 0;
+  int get scrollHeight() => 0;
+  int get scrollWidth() => 0;
+  int get clientLeft() => 0;
+  int get clientTop() => 0;
+  int get offsetLeft() => 0;
+  int get offsetTop() => 0;
+  int get scrollLeft() => 0;
+  int get scrollTop() => 0;
+  String get contentEditable() => "false";
+  bool get isContentEditable() => false;
+  bool get draggable() => false;
+  bool get hidden() => false;
+  bool get spellcheck() => false;
+  int get tabIndex() => -1;
+  String get id() => "";
+  String get title() => "";
+  String get tagName() => "";
+  String get webkitdropzone() => "";
+  Element get firstElementChild() => elements.first();
+  Element get lastElementChild() => elements.last;
+  Element get nextElementSibling() => null;
+  Element get previousElementSibling() => null;
+  Element get offsetParent() => null;
+  Element get parent() => null;
+  Map<String, String> get attributes() => const {};
+  // Issue 174: this should be a const set.
+  Set<String> get classes() => new Set<String>();
+  Map<String, String> get dataAttributes() => const {};
+  CSSStyleDeclaration get style() => new EmptyStyleDeclaration();
+  ClientRect getBoundingClientRect() => new EmptyClientRect();
+  List<ClientRect> getClientRects() => const [];
+  bool matchesSelector([String selectors]) => false;
+
+  // Imperative Element methods are made into no-ops, as they are on parentless
+  // elements.
+  void blur() {}
+  void focus() {}
+  void scrollByLines([int lines]) {}
+  void scrollByPages([int pages]) {}
+  void scrollIntoView([bool centerIfNeeded]) {}
+
+  // Setters throw errors rather than being no-ops because we aren't going to
+  // retain the values that were set, and erroring out seems clearer.
+  void set attributes(Map<String, String> value) {
+    throw new UnsupportedOperationException(
+      "Attributes can't be set for document fragments.");
+  }
+
+  void set classes(Collection<String> value) {
+    throw new UnsupportedOperationException(
+      "Classes can't be set for document fragments.");
+  }
+
+  void set dataAttributes(Map<String, String> value) {
+    throw new UnsupportedOperationException(
+      "Data attributes can't be set for document fragments.");
+  }
+
+  void set contentEditable(String value) {
+    throw new UnsupportedOperationException(
+      "Content editable can't be set for document fragments.");
+  }
+
+  String get dir() {
+    throw new UnsupportedOperationException(
+      "Document fragments don't support text direction.");
+  }
+
+  void set dir(String value) {
+    throw new UnsupportedOperationException(
+      "Document fragments don't support text direction.");
+  }
+
+  void set draggable(bool value) {
+    throw new UnsupportedOperationException(
+      "Draggable can't be set for document fragments.");
+  }
+
+  void set hidden(bool value) {
+    throw new UnsupportedOperationException(
+      "Hidden can't be set for document fragments.");
+  }
+
+  void set id(String value) {
+    throw new UnsupportedOperationException(
+      "ID can't be set for document fragments.");
+  }
+
+  String get lang() {
+    throw new UnsupportedOperationException(
+      "Document fragments don't support language.");
+  }
+
+  void set lang(String value) {
+    throw new UnsupportedOperationException(
+      "Document fragments don't support language.");
+  }
+
+  void set scrollLeft(int value) {
+    throw new UnsupportedOperationException(
+      "Document fragments don't support scrolling.");
+  }
+
+  void set scrollTop(int value) {
+    throw new UnsupportedOperationException(
+      "Document fragments don't support scrolling.");
+  }
+
+  void set spellcheck(bool value) {
+     throw new UnsupportedOperationException(
+      "Spellcheck can't be set for document fragments.");
+  }
+
+  void set tabIndex(int value) {
+    throw new UnsupportedOperationException(
+      "Tab index can't be set for document fragments.");
+  }
+
+  void set title(String value) {
+    throw new UnsupportedOperationException(
+      "Title can't be set for document fragments.");
+  }
+
+  void set webkitdropzone(String value) {
+    throw new UnsupportedOperationException(
+      "WebKit drop zone can't be set for document fragments.");
+  }
+}